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99
XMEGA A [MANUAL]
8077I鈥揂VR鈥�11/2012
8.
Power Management and Sleep Modes
8.1
Features
Power management for adjusting power consumption and functions
Five sleep modes
鈥揑dle
鈥� Power down
鈥� Power save
鈥� Standby
鈥� Extended standby
Power reduction register to disable clock and turn off unused peripherals in active and idle modes
8.2
Overview
Various sleep modes and clock gating are provided in order to tailor power consumption to application requirements.
This enables the XMEGA microcontroller to stop unused modules to save power.
All sleep modes are available and can be entered from active mode. In active mode, the CPU is executing application
code. When the device enters sleep mode, program execution is stopped and interrupts or a reset is used to wake the
device again. The application code decides which sleep mode to enter and when. Interrupts from enabled peripherals
and all enabled reset sources can restore the microcontroller from sleep to active mode.
In addition, power reduction registers provide a method to stop the clock to individual peripherals from software. When
this is done, the current state of the peripheral is frozen, and there is no power consumption from that peripheral. This
reduces the power consumption in active mode and idle sleep modes and enables much more fine-tuned power
management than sleep modes alone.
8.3
Sleep Modes
Sleep modes are used to shut down modules and clock domains in the microcontroller in order to save power. XMEGA
microcontrollers have five different sleep modes tuned to match the typical functional stages during application
execution. A dedicated sleep instruction (SLEEP) is available to enter sleep mode. Interrupts are used to wake the
device from sleep, and the available interrupt wake-up sources are dependent on the configured sleep mode. When an
enabled interrupt occurs, the device will wake up and execute the interrupt service routine before continuing normal
program execution from the first instruction after the SLEEP instruction. If other, higher priority interrupts are pending
when the wake-up occurs, their interrupt service routines will be executed according to their priority before the interrupt
service routine for the wake-up interrupt is executed. After wake-up, the CPU is halted for four cycles before execution
starts.
Table 8-1 on page 100 shows the different sleep modes and the active clock domains, oscillators, and wake-up sources.
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